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We apply phosphorus (P) doping to amorphous silicon (a-Si)/crystalline silicon (c-Si) heterojunction solar cells realized by exposing c-Si to Prelated radicals generated by the catalytic cracking of PH 3 molecules (Cat-doping). An ultrathin n + -layer formed by P Cat-doping acts to improve the effective minority carrier lifetime (τ eff ) and implied open-circuit voltage (implied V oc ) owing to its field effect by which minority holes are sent back from an a-Si/c-Si interface. An a-Si/c-Si heterojunction solar cell with a P Cat-doped layer shows better solar cell performance, particularly in V oc , than the cell without P Cat-doping. This result demonstrates the feasibility of applying Cat-doping to a-Si/c-Si heterojunction solar cells, owing to the advantage of the low-temperature (<200°C) process of Cat-doping.

Abstract:Recently, the wireless power transmission (WPT) system is expected to employ as a means to transmit power to capsular endoscope diagnosing the digestive organs. In order to increase transmission efficiency, in this study, we proposed a transmitting spiral antenna which can transmit adequate power to the capsular endoscope with being independent of its position and direction. In this paper, we discussed the power transmission efficiency and SAR on human body by means of FDTD method and experimentation. Keywords: WPT, FDTD method, Archimedean spiral antenna, array antenna Classification: Antennas and Propagation References

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